Differential optical absorption spectroscopy (DOAS) technique has been used to measure trace gases in the atmosphere by their strongly structured absorption of radiation in the UV and visible spectral range, e.g. SO_2, NO_2, O_3 etc.

• 差分吸收光谱技术(differential optical absorption spectroscopy,DOAS)是利用气体分子在紫外-可见光谱范围的特征吸收来测量其浓度含量,如SO2,NO2,O3等。